public NIOInputStream(ByteBuffer in) 
{
        this.in = in;
}

 public int available() throws IOException 
{
        return in.remaining();
}

 public  void close() throws IOException 
{

}

 public boolean markSupported() 
{
        return false;
}

 public int read() throws IOException 
{
        try {
            int rc = in.get() & 0xff;
            return rc;
        } catch (BufferUnderflowException e) {
            return -1;
        }
}

 public int read(byte[] b,
    int off,
    int len) throws IOException 
{
        if (in.hasRemaining()) {
            int rc = Math.min(len, in.remaining());
            in.get(b, off, rc);
            return rc;
        } else {
            return len == 0 ? 0 : -1;
        }
}

 public long skip(long n) throws IOException 
{
        int rc = Math.min((int)n, in.remaining());
        in.position(in.position() + rc);
        return rc;
}